$16\mathrm{.}8\mathrm{.}1$: PRACTICE: Branches$**$: $24-$hour time

$24-$hour time $($also known in the U$.$S$.$ as military time$)$ is widely used around the world. Time is expressed as hours since midnight. The day starts at $00$:$00,$ and ends at $23$:$59.$ Write a program that converts am$/$pm time to $24-$hour time. The input is two numbers and a string. If the input is $230$ pm$,$ the output should be $14$:$30.$ If the input is $1201$ am$,$ the output should be $00$:$01.$

Hints:

Think of how each hour should be handled. $1200$ am $-1259$ am becomes what? $800$ am becomes what? $1200$ pm$?100$ pm$?$ Group the hours into cases that should be handled similarly $($e$.$g$.,100$ am to $1100$ am are handled the same$).$

Declare variables for hoursAmPm, minAmPm, and hours$24.$ Note that minutes for $24-$hour time remain the same as for am$/$pm$,$ so no extra variable is needed.

Use an if$-$else statement to detect each case, and set the hours$24$ appropriately.

When outputting hour$24,$ check if the hour is $0-9($just check for $<10).$ If so$,$ output a $"0".$ So $7$ will be output as $07.$ Do the same when outputting the minutes.

import java.util.Scanner;

public class main $\{$

public static void main$($String$[]$ args$)\{$

Scanner scnr $=$ new Scanner$($System$.$in$)$;

$/*$ Type your code here. $*/$

$\}$

$\}$